Safety-guard for stamping-presses.



J. M. JONES. SAFETY GUARD FOR STAMPING PRESSES.

APPLICATION FILED 4m}. 18, I910.

977,953. v I I Patented D'ec. 6, 1910.

2 SHEETS SEEET 1. V

J. M. JONES. SAFETY GUARD FOR'STAMPING PEESSES.

APPLICATION FILED AUG.18, 1910.

Patented Dec.6, 1910.

2 SHEETS-SEER! 2.

JAMES MELVIN JONES, OF BUFFALO, NEW YORK.

SAFETY-GUARD FOR STAMPING-PRESSES.

Specification of Letters Patent.

Patented Dec. 6,1910.

. Application filed August 18, 1910. ,Serial No. 577,812.

To all whom it may concern:

Be itknown that 1, Jaime MELVIN JONES,

' a citizen of the Dominion of Canada, residing at 44 Henry street,Buffalo, in the county of Erie and State of New York,

have invented a new and useful Safety- Guard for Stamping- Presses, ofwhich the following is a specification.

My invention relates to a safety guard and means for actuating the samewhich is adapted for attachment to stamping presses 'orany other classof machine where there is a danger of the 'operators fingers or handsgettingcaught between the die and matrix for example and consequentlyinjured or cut The invention primarily consists of a safety attachmentfor machines of the type above referred to which is characterized by itsextreme simplicity in construction while at the same time positivelyinsuring that the safety guard will not allow the die of the press todescend atall until the guardis down flush with the table, or, in otherwords, so long as there is the slightest obstruction between the loweredge of the gate and the upper'face of'the matrix or that part of themachine upon which it may be mounted, the die is effectively heldelevated and prevented from descending.

A further feature of the invent-ion consists in providing rigid anddirect connections between the foot-lever and the guard operating lever,and between said latter lever and the latch mechanism whereby positiveaction is insured.

A still further feature of the invention resides in the fitment of anadjustable buffer device or shock absorber in connection with the guardoperating lever.

Another object of my invention is the provision of means which insurethe immovableness of the guard gate when adjusted to press with theimproved mechanism attached v and the gate or guard raised. Fig. 2, 1s asimilar view but showmg the guard lowered and impeded by. anobstruction, as herein after more fully "explained. Fig. 3, is a likeillustration to the two preceding ones but exemplifying the guard downor fully low.- ered to permit the stamping operation. Fig. 4, is anenlarged plan of the means for locking the guard gate at the requiredposition. Fig. 5, is a sectional elevation on the line a, a, in Fig. 4.Fig. 6, is a sectional elevation of the guard operating lever bufferdevice. Fig. 7-, is a plan of the same. Fig. 8, is a vertical sectionthrough the contact stop for the buffer device shown in Figs. 6 and 7;and Fig. 9, is a front view of the same. Like reference numeralsdesignate the same parts throughout the several figures.

According to my invention and as illustrated 1, designates one knownform of stamping press, of which there are numerous types, but it is tobe clearly understood that my improved safety guard is equallyapplicable to all with but very slight modification and that only tomake it conform to the particular construction of press. 7

2, is a lever or bar mounted at the side of the press, 1, by means of aslotted bracket or sleeve, 3, which in turn is pivotally mounted on apin or bolt, 4, carried by a bracket, 5, projecting laterally from thepress frame.

6, is a nut threaded upon the outer end of the pin, 4, for adjusting thesleeve, 3, and 7, is a set screw for locking said nut, 6, when properlyadjusted. To providevmeans for adjusting the lever, 2, I fit the sleeve3, with a set screw 8, which, when slackened allows said lever 2, to bemoved longitudinally of its axis and thereby adapt the guard foraccurate adjustment relative to the die, 9, and matrix 10. To one sideof the bracket 3, and adjustable longitudinally of the lever 2, I fitaslotted bracket 11, which is clamped in place by means of'a set screw12, and said bracket has pivotally connected thereto a connecting rod13, whic'hpasses through a block or coupling piece 14, and is heldthereto by a set screw 15. 16 is another short connecting rod held tothe couplingpiece, 14, by lock nuts, 17, said rod being fastened atitsupper end to the releasing latch 18, of

the press 1, and this means it will be seen that the distance betweenthe said latch, 18,

vertical connecting rod, 22, the lowerpart,

50 j a boxshaped sleeve, 39, adapted for clamp-. ing engagement with thelever 2, by meansv connecting rod, 24, is united by appropriate meanswith the foot lever or treadle, 26. Secured at or near the front end ofthe lever by a set screw 27, is a box-shaped bracket, 28,shown in detailby Figs. .4, and 5,' furnished with a more or less vertically situatedslot in which is made to fit a smooth bar 29, provided at its lower endwith a horizontally disposed arm 30, having at- 29, 30, and 31, comprisein their entirety the safety guard proper which is made to moveup'and'down in front of the die, 9-, and matrix 10;"as hereinafter fullydescribed;

' In order to insure that the guard 31, may be properly adjusted andwhen so adjusted be effectively prevented from displacement :I form onthe inner edge of the bar 29 fine teethor serrations, 32, with whichcooperate a-similarlytoothed key-piece, 33. This keypiece 33, isdisposed in a vertically situated slot, 34, and is prevented fromfalling out, "when theparts are disconnected, by split pins, 35. Lockingengagement. of the. parts 33, and 29 is efiected by means of a set screw6'- cooperating with a notch 37, in the back Pthekey piece, 33. A locknutnot I'wn-ma'y if desired be fitted in connec ion with the set-screw,36,.for further in- '1suringpositive rigidity of the parts v29, 30, and31, when'assembled and adjusted' In practice Ihave found thatconsiderable I and much unnecessarynoise is caused during themanipulation of the safety guards by the tendency of the lowerv edge ofthe guard to hammer, or approximately so, upon the bed, .38, supportingthe matrix, 10, and in order to effectively obviate any such tendencywith my improved appliance I fit a bufier or shock absorbing device,shown to an enlarged scale andin detail by Figs. 6, 7, 8, and 9inclusive; This device consists essentially of two parts one of which isattached jto the lever 2, and the other carried by the press frame. Theformer part consists of of a set screw 40, and at one side of saidbox-sleeve I form a cylindrical or other rod 42, having a plunger 43 atits lower end under theaction of a coil spring 44, lock lowered duringthe stamping operation and.

, it is adapted for attachment to the press frame '1 by means of aclamping plate 47' tachedthereto a wire screen 31. The parts shapedrecess 41, in which is fitted'a piston and set screws or bolts 48, Figs.1, 2, and 3, and it is to be particularly noted that I serrate themeeting faces of the angle bracket and clamping plate as shownat 49, 50,respectively to insure absolute acljustability, and perfect rigiditywhen so adjusted;

In use, and-after .the die and matrix have been fixed in place, it willbe seen from the foregoing description and accompanying drawingsthat-the guard 31, may be easily and accurately adjusted relative to thebed 38, and furthermore, that the die' 9, cannot descend on to thematrix 10, until the gate guard 31, is fully down in front thereof. If athin piece of sheet metal for example such as is indicated at 51, Fig.2,-be placed on the matrix 10, the die 9, cannot descend so. long as thegate guard 31 rests thereon. In other words by my invention I haverenderedit possible with machines fitted therewith for a piece .of metalone-thirty-sec'ond of an inch in thickness placed between the bar. 30,and the bed 38, to positively prevent the die 9 descending with force,as the said guard bar 30, must be brought to its lowest point in contactwith the bed 38-before the latch mechanism 18, 'is released to permitthe impact to take place for stamping anything placed on the matrix 10.

' Thus-it will be seen that by my improvements I have effected a, verygreat improve ment in safety guard appliances and at the same timesimplified their construction considerably, while by making a direct andrigid connection from the foot-lever to the guard operating-lever, andthence to the latch mechanism positive action is always insured.

Finally I wish to point out that my'safety guard device may be adaptedtoall types of stamping press'es worked or operated by a foot leverrelease for the latch mechanism with but little alteration as all. artsare made relatively adjustable and w thout in anyway departing from theessential features. as hereinbefore specifically set forth, for exampleafter the rods 13, l6,have been accurately adjusted to a particular typeof stamping press they may be disconnected from thelatch 18, and'lever2, and. welded to the coupling-piece 14, and thereby renderedpermanently rigid as will be self evident from the foregoingstatement. 1

I claim 1. The combination with a stamping press of a safety guardattachment comprisinga lever pivoted by' means. of a slotted'bracket toa projection on thepre'ssframe, an adjustable guard-carried by saidlever-andadapted forv up and down. movement in front of the dies, anadjustable buffer device carried by the aforesaiclxlever for; preventinghammering and ri d connectionsbetween 1 arm of said bar, teeth formed onthe nner ofthe arm reteivcd in the aforesaid.

said lever and the latch andifoot lever substantially as set'forth.

- 2. In combination withthe latch and foot.

lever of a stamping press, a-lever pivoted to the pressframeworkintermediate said latch the front end of said intermediatelever and adapted to be firmly clamped thereto, a slot eige of the arm 1operatlon with for locking said key-piece to said arm and rigidconnections --"j'lever' to the latch an'dfoot lever, substan- -"2b' 5-3. In combinatlon with the latch and foot 5f lever of a stamping thepress framework intermediate sald latch and foot lever by '25. the frontend of adapted to be firmly clamped thereto, a slot formed in one sidebracket to receive one awire screen rigidly arm of said bar,

of said box-shaped arm of an angle bar, attached to the other teethformed on the inner received in the aforesaid s t, a similarly toothedkey-piece for cosaid toothed armya set screw from said intermediatetially as described for the purpose specified.

press, a lever pivoted to means of a slotted bracket,

21' box-shaped bracket arranged at or near said intermediate lever andormed in one side of said box-shaped bracket 'to receive one arm of anangle bar, a;wire screen rigidly attached to the other slot, a similarlytoothedMkey-piece for cooperation with said toothed arm, a set screw forlocking said key-piece box-shaped sleeve 'adapted for clamping ento saidarm, a

recess in which is dissaid box-shaped connections between theintermediate lever and the latch and foot lever, substantially asdescribed for the purpose specified.

it. In combination with the latch and foot lever of a stamping press,the lever 2, having slotted bracket 5 thereon, box-shaped I bracket28,provided with slot 34, to receive toothed arm 29, toothed key-piece 33,and 4 set screws 36, for locking said key-pieceand toothed arm together,substantially as shown. e

5. In combination with the latchand foot lever of a stamping press, thebox shaped sleeve, 39, having a cylindrical recess 41, at one sidethereof, piston rod 42, with plunger head 48, and coil spring 44,arranged in said recess 41, and adapted for adjustment by lock nuts 45,and angle bracket 4L6, with clamping plate, 47, for fixture on the pressframe, substantially as shown.

Signed at Hamilton, Ontario this 12th day of August,19l0. v

. JAMES MELVIN J ONES.

a In the presence of I ALFRED T. BRATTON, EDWIN S. GILBERT.

